Classic rockers, metalheads, and indie kids all share a love for Led Zeppelin. Echoes of Robert Plant's banshee wail can be heard in the four-octave howl of grunge god Chris Cornell, while their whimsical, folksy side helped shape Heart's acoustic-rich hard rock. As for guitarists who soaked up Jimmy Page's colossal boogie propulsion, look no further than GnR riff-slayer Slash.